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authorMattes D <github@xoft.cz>2017-01-13 10:31:05 +0100
committerGitHub <noreply@github.com>2017-01-13 10:31:05 +0100
commitfb0fc07579359c0055fc4ad92a005aa89dc9b817 (patch)
tree6a1555b1d714dc05617f23a41a1916993161c41a /src/Bindings
parentLuaState: Fixed race condition in ref tracking. (#3529) (diff)
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Diffstat (limited to 'src/Bindings')
-rw-r--r--src/Bindings/LuaState.cpp11
-rw-r--r--src/Bindings/LuaState.h24
2 files changed, 22 insertions, 13 deletions
diff --git a/src/Bindings/LuaState.cpp b/src/Bindings/LuaState.cpp
index 61d206109..b768b21a3 100644
--- a/src/Bindings/LuaState.cpp
+++ b/src/Bindings/LuaState.cpp
@@ -218,7 +218,7 @@ void cLuaState::cTrackedRef::Clear(void)
// Free the reference:
lua_State * luaState = nullptr;
{
- auto cs = m_CS;
+ auto cs = m_CS.load();
if (cs != nullptr)
{
cCSLock Lock(*cs);
@@ -246,7 +246,7 @@ void cLuaState::cTrackedRef::Clear(void)
bool cLuaState::cTrackedRef::IsValid(void)
{
- auto cs = m_CS;
+ auto cs = m_CS.load();
if (cs == nullptr)
{
return false;
@@ -261,7 +261,7 @@ bool cLuaState::cTrackedRef::IsValid(void)
bool cLuaState::cTrackedRef::IsSameLuaState(cLuaState & a_LuaState)
{
- auto cs = m_CS;
+ auto cs = m_CS.load();
if (cs == nullptr)
{
return false;
@@ -285,7 +285,7 @@ bool cLuaState::cTrackedRef::IsSameLuaState(cLuaState & a_LuaState)
void cLuaState::cTrackedRef::Invalidate(void)
{
- auto cs = m_CS;
+ auto cs = m_CS.load();
if (cs == nullptr)
{
// Already invalid
@@ -548,6 +548,7 @@ void cLuaState::Close(void)
{
r->Invalidate();
}
+ m_TrackedRefs.clear();
}
cCanonLuaStates::Remove(*this);
@@ -2357,6 +2358,7 @@ void cLuaState::cRef::RefStack(cLuaState & a_LuaState, int a_StackPos)
{
UnRef();
}
+ ASSERT(cCanonLuaStates::GetCanonState(a_LuaState)->m_CS.IsLockedByCurrentThread());
m_LuaState = a_LuaState;
lua_pushvalue(a_LuaState, a_StackPos); // Push a copy of the value at a_StackPos onto the stack
m_Ref = luaL_ref(a_LuaState, LUA_REGISTRYINDEX);
@@ -2370,6 +2372,7 @@ void cLuaState::cRef::UnRef(void)
{
if (IsValid())
{
+ ASSERT(cCanonLuaStates::GetCanonState(m_LuaState)->m_CS.IsLockedByCurrentThread());
luaL_unref(m_LuaState, LUA_REGISTRYINDEX, m_Ref);
}
m_LuaState = nullptr;
diff --git a/src/Bindings/LuaState.h b/src/Bindings/LuaState.h
index 01faf2c26..80f5c3cc6 100644
--- a/src/Bindings/LuaState.h
+++ b/src/Bindings/LuaState.h
@@ -35,6 +35,7 @@ extern "C"
#include "lua/src/lauxlib.h"
}
+#include <atomic>
#include "../Vector3.h"
#include "../Defines.h"
#include "PluginManager.h"
@@ -189,24 +190,29 @@ public:
}
/** Set the contained reference to the object at the specified Lua state's stack position.
- If another reference has been previously contained, it is freed first. */
+ If another reference has been previously contained, it is Clear()-ed first. */
bool RefStack(cLuaState & a_LuaState, int a_StackPos);
- /** Frees the contained reference, if any. */
+ /** Frees the contained reference, if any.
+ Untracks the reference from its canon Lua state. */
void Clear(void);
- /** Returns true if the contained reference is valid. */
+ /** Returns true if the contained reference is valid.
+ (Note that depending on this value is not thread-safe, another thread may invalidate the ref in the meantime. It is meant for quick ASSERTs only). */
bool IsValid(void);
/** Returns true if the reference resides in the specified Lua state.
- Internally, compares the reference's canon Lua state. */
+ Internally, compares the reference's canon Lua state.
+ (Note that depending on this value is not thread-safe, another thread may modify the ref in the meantime. It is meant for quick ASSERTs only). */
bool IsSameLuaState(cLuaState & a_LuaState);
protected:
friend class cLuaState;
- /** The mutex protecting m_Ref against multithreaded access */
- cCriticalSection * m_CS;
+ /** The mutex protecting m_Ref against multithreaded access.
+ Actually points to the canon Lua state's m_CriticalSection.
+ Is nullptr when ref is empty (not bound). */
+ std::atomic<cCriticalSection *> m_CS;
/** Reference to the Lua callback */
cRef m_Ref;
@@ -254,7 +260,7 @@ public:
template <typename... Args>
bool Call(Args &&... args)
{
- auto cs = m_CS;
+ auto cs = m_CS.load();
if (cs == nullptr)
{
return false;
@@ -336,7 +342,7 @@ public:
template <typename... Args>
bool CallTableFn(const char * a_FnName, Args &&... args)
{
- auto cs = m_CS;
+ auto cs = m_CS.load();
if (cs == nullptr)
{
return false;
@@ -356,7 +362,7 @@ public:
template <typename... Args>
bool CallTableFnWithSelf(const char * a_FnName, Args &&... args)
{
- auto cs = m_CS;
+ auto cs = m_CS.load();
if (cs == nullptr)
{
return false;